The diesel engine's task is to convert the chemical energy, embedded in a very ignition-willing fuel, as efficiently as possible and with few emissions into mechanical energy.
Pure air is sucked in. Without supercharging a minimum compression of 18 : 1 is necessary for the combustion. (approx. 30 bar) The fuel is injected into the heated air. This takes place with a nozzle opening pressure of around 130 bars for the outdated side combustion chamber process, making use of the modern direct injection method substantially higher pressures are in place. Without electric ignition system the combustion occurs immediately (self-ignition). The injection pressure is generated by a mechanical high-pressure pump and through nozzles, reaches the combustion chamber.
|Petrol||compared with||Diesel + 13%|
In contrast to the petrol engine there is always more than enough air in all operational stages, also without supercharging. Therefore, and because of the high temperatures nitrogen oxides (NOX) tent to develop more easily. The shorter mixture formation and the approx. 13% higher C concentration in the diesel fuel in comparison to petrol fuel raises also the ejection of soot (particles). The diesel engine stands at the beginning of its exhaust gas cleaning program, the petrol-driven cars surpassed this stage already.
|Combustion procedures||System pressure||Efficiency|
|Direct-injection||Piston chamber||450 - 2.200 bar||Up to 48%|
|Side combustion chamber|
|Pre-ignition chamber||Up to 450 bar||20 - 38%|
|Subaru produces the diesel as a boxer engine|
|The strongest diesel engine in the world|
|Cubic capacity||More than 25 m³ (14 cylinders)|
|Performance||80.000 kW (109.000 PS)|
|Engine weight||Ca. 3000 tons|
|Consumption||Up to 13 tons/h|
|Type of fuel||Heavy fuel oil|
|Rated speed||Just under 100 1/min|
|Top speed||30 knots (just under 50 km/h)|